I've been using Calibre Companion with my Glowlight 3 and it has been working really well.
When I first got my nook I was sideloading to the "spsd" (sideload) partition with Calibre via USB and I had lots of corruption issues causing me to re-transfer all my books and then the nook software re-scanning all my books. Since using CC I haven’t had any corruption or database issues. It also has a lot of the Calibre options like Series, Tags, and even custom metadata.
CC can’t see the “spsd” partition and the default save location isn’t scanned by the nook software (which I don’t want it to). I use the Wireless Device Connection in Calibre to transfer my books and you can set CC to open your books with the nook software. I also have Zeam Launcher set as my default launcher (Needed to be able to launch CC).
My Glowlight 3 is rooted but only to re-map the hardware buttons and add a back button for some other apps. As far as I can see you don’t need a back button in CC.
App versions I’m using: Calibre Companion 5.4.3.3 and Zeam Launcher 3.1.10.
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